[PATCH] kernel: provide module.lds for out of tree builds in v5.10+

Bruce Ashfield
2020-11-13T06:32:09Z

From: Bruce Ashfield <bruce.ashfield@gmail.com>

The upstream commit 596b0474d3d [kbuild: preprocess module linker
script], adds a dependency on module.lds for external module
building.

Since module.lds is generated as part of 'modules_prepare', we
must make it available with the other kernel artifacts in the
kernel shared workdir, otherwise out of tree builds fail.

This fixes errors like:

| make[4]: *** No rule to make target 'scripts/module.lds', needed by
'build/tmp/work/qemuarm64-poky-linux/cryptodev-module/1.11-r0/git/cryptodev.ko'.
Stop.
| make[4]: *** Waiting for unfinished jobs....

We also ensure that kernel-devsrc has a copy to support on
target module builds that are often prepared with 'make scripts
prepare'. Those targets won't regenerate it, so the build fails.
If 'make modules_prepare' is used, the file will be regenerated
and overwrite our copy (as expected).

Signed-off-by: Pan, Kris <kris.pan@intel.com>
Signed-off-by: Lili Li <lili.li@intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
---
meta/classes/kernel.bbclass | 1 +
meta/recipes-kernel/linux/kernel-devsrc.bb | 6 ++++++
2 files changed, 7 insertions(+)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index be93a258f6..ccd74e61e8 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -494,6 +494,7 @@ do_shared_workdir () {
# Copy files required for module builds
cp System.map $kerneldir/System.map-${KERNEL_VERSION}
[ -e Module.symvers ] && cp Module.symvers $kerneldir/
+ [ -e scripts/module.lds ] && install -Dm 0644 scripts/module.lds $kerneldir/scripts/module.lds
cp .config $kerneldir/
mkdir -p $kerneldir/include/config
cp include/config/kernel.release $kerneldir/include/config/kernel.release
diff --git a/meta/recipes-kernel/linux/kernel-devsrc.bb b/meta/recipes-kernel/linux/kernel-devsrc.bb
index 81b1e36041..5f0dedbdf7 100644
--- a/meta/recipes-kernel/linux/kernel-devsrc.bb
+++ b/meta/recipes-kernel/linux/kernel-devsrc.bb
@@ -100,6 +100,12 @@ do_install() {
# be dealt with.
# cp -a scripts $kerneldir/build

+ # although module.lds can be regenerated on target via 'make modules_prepare'
+ # there are several places where 'makes scripts prepare' is done, and that won't
+ # regenerate the file. So we copy it onto the target as a migration to using
+ # modules_prepare
+ cp -a --parents scripts/module.lds $kerneldir/build/ 2>/dev/null || :
+
if [ -d arch/${ARCH}/scripts ]; then
cp -a arch/${ARCH}/scripts $kerneldir/build/arch/${ARCH}
fi
--
2.19.1